Absolute value of a:
This expression represents the magnitude of a variable without regard to its sign. It signifies the distance from zero on a number line. That is the absolute value of -6 is 6 because -6 is 6 unit from zero. Likewise the absolute value of+6 is 6 because it, too is 6 units from zero. It gives the symbols ¦A¦ where A is any number or variable.
Sum of N values:
Σ Xi indicates the sum of numbered (indexed) values. For example, if the Xi are
grades for the individual students in a class the sum of the Xi (grades) for the students in the class of N students, divided by N, gives the average grade.
An angle is a set of points consisting of two rays with a common midpoint. It is given the symbol Ð.
An expression used to indicate a fraction of the whole, such as 50% of 90 is 45. It is given the symbol %.
A mathematical operation that, at its simplest, is an abbreviated process of adding an integer to itself a specified number of times. It is given the symbols x, , or * (computer).
A mathematical process that subjects a number to the operation of finding out how many times it contains another number. It is given the symbol ÷ or /.
Greater than or equal to
It is given the symbol >, and denotes one quantity is equal to or larger than another.
Less than or equal to:
It is given the symbol <, and denotes one quantity is equal to or smaller than another.